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Unformatted text preview: People often find it easier to be a result of the past than a cause of the future. Birzeit University Physics Department Physics 112 Experiment No.5 CAPACITORS and INDUCTORS Students Name: Ammar T. Ammar Students No.: 1040385 Section: 7 Date: 18/3/2005 Instructor: Dr. Ziyad Izzat 2005 Copy left reversed Abstract: The aim of the experiment: is to study the behavior of capacitors and inductors in electric circuits , and know the main features of such circuits and how they function. The method used: by using the oscilloscope to see how the potential difference changes as a function of time. Main results: Theory: I- RC circuits Charging a capacitor: During the positive half period of the square wave, the charge in the simple RC circuit shown in fig(l) builds up on the capacitor plates according to the following formula; ) 1 ( ) ( RC t e C t Q-- = The voltage across the capacitor plates is defined by: C Q V C = and therefore ; ) 1 ( RC t e Vc-- = RC is usually called the time constant ( ) of the RC circuit. has the unit of time (sec ) and is a measure of how fast the voltage across the capacitor rises. When t = , 63 . = V or, the voltage across the capacitor rises to 0.63 of its maximum value. The current passing through the circuit is given by:...
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- Spring '10